Max Machinery 121 INDICATOR - Manual (Page 13)

Batching
121-000-350 © 2001 Max Machinery, Inc. Pg 13
3.4 Batching
Measurements:
A flowmeter measures the actual volume in a liquid line. A temperature sensor can also
be installed to correct for liquid thermal expansion (see 3.2 Corrected Volume).
Calculations:
• For Flowmeters with Pulse Outputs, Volume flow is calculated using the flowmeter frequency output and the
user entered K-Factor.
• For Flowmeters with Analog Transmitters, Volume flow is calculated using the measured flowmeter signal and
the user entered scale settings.
• Corrected Volume is calculated using the flow and temperature inputs as well as the
thermal expansion coefficient stored in the flow computer.
Output Results:
• Display Results
Flow Rate, Batch Total, Non-Resettable Total, Temperature, Density
• Analog Output
Rate, Total, Temperature or Density
• Pulse Output
Total
• Relay Outputs
Batch Total, Rate, or Temperature Alarms
Applications:
Batching and monitoring flow and total of any liquid. Batching is accomplished via
relays and datalogging is available via analog (4-20mA) and serial outputs.
Batching Illustration
Volume Flow
As calculated in section 3.1
Corrected Volume Flow (Temp. Transmitter)
Corrected Vol. Flow = volume flow • (1 - Therm.Exp.Coef. •(Tf-Tref)) 2
Calculations
Temp./Dens.
Transmitter